Upgrading Speaker Components

Just swapping components is difficult on more than one level. First, finding drivers with the exact same diameter as the previous ones and the same recess depth can be extremely difficult. Second, the cabinet was built to work with those drivers, so you'd have to also find drivers that work with the same internal volumes.

Next, you can never swap out a driver without completely redesigning the crossover, ever. There might be one instance out of three hundred that this would work. (Seas makes a tweeter with the same measurements in both a soft dome and metal dome, those are interchangeable-the only driver I can think of that this works with). That makes it close enough to never for me.

If you are going to mod speakers, you can try changing internal wiring, or potentially upgrade the crossover components (make sure they are exactly the same values including voltages on caps), and maybe adding internal bracing. Other than that, you're better off contacting someone like Jed at clearwave loudspeakers for help with a custom design - no one offers better value in my opinion, he doesn't not charge for crossover design. It will be designed to meet your specs, and work in your room.